Musnad Ahmad 28:255

Zakariya ibn 'Adi narrated to us, 'Ubayd Allah narrated to us, from 'Abd al-Karim, from 'Amr ibn Shu'ayb, from his father, from his grandfather, that a man said: "O Messenger of Allah, I gave my mother a garden during her lifetime, and she has died and left no heir other than me." The Messenger of Allah (peace and blessings of Allah be upon him) said: "Your charity has become binding, and your garden has returned to you."